Evolutionary pressures like selection happen on every level, from genetic to individual to social. There's pressure on an individual baby to survive, as there's pressure on a mother to keep a child alive, as there's pressure on a social group to keep its mothers and babies alive. It's a common misconception to frame evolution as only happening on an individual genetic scale.
Additionally, mortality isn't the only evolutionary pressure. For example, the ability to reproduce is a pressure, as is the ability to raise young who live long enough to reproduce, as is the ability to raise young who raise young who live long enough to reproduce.
Not to mention noticeable shifts usually take hundreds of generations to manifest, with the exception of very strong selectors like malaria and sickle cell.
Evolutionary pressures like selection happen on every level, from genetic to individual to social. There's pressure on an individual baby to survive, as there's pressure on a mother to keep a child alive, as there's pressure on a social group to keep its mothers and babies alive. It's a common misconception to frame evolution as only happening on an individual genetic scale.
Additionally, mortality isn't the only evolutionary pressure. For example, the ability to reproduce is a pressure, as is the ability to raise young who live long enough to reproduce, as is the ability to raise young who raise young who live long enough to reproduce.
Not to mention noticeable shifts usually take hundreds of generations to manifest, with the exception of very strong selectors like malaria and sickle cell.